terraform dns entries broken

mailgun-broken.tf

# ideally we could create the dns entries by iterating over
# each record but terraform currently doesn't computed variables
# when using count. 

resource "aws_route53_record" "mailgun_sending" {
  # create an route 53 entry for each record for the mailgun domain
  count     = "${length(mailgun_domain.domain.sending_records)}"
  zone_id   = "${data.aws_route53_zone.domain.zone_id}"
  ttl       = "300"
  # select the record name from the current count
  name      = "${element(mailgun_domain.domain.sending_records.*.name, count.index)}"
  # select the record type from the current count
  type      = "${element(mailgun_domain.domain.sending_records.*.record_type, count.index)}"
  # select the record value from the current count
  records   = ["${element(mailgun_domain.domain.sending_records.*.value, count.index)}"]
}